1. Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland; Department of Molecular Physics, Technical University of Lodz, Żwirki 36, 90-924 Lodz, Poland; and Institute of Applied Radiation Chemistry, Technical University of Lodz, Wróblewskiego 15, 93-590 Lodz, Poland